Microstructure and mechanical properties of selective laser melted Ti-3Al-8V-6Cr-4Zr-4Mo compared to Ti-6Al-4V

Beta Ti-alloys are known for their high fracture toughness and ductility, and are used in applications where these properties are needed, such as the aerospace and biomedical industries. The selective laser melting of the alpha + beta Ti-6Al-4V alloy has been extensively studied for applications in the aerospace industry. Although there has been success in building small parts, the acicular α′ microstructure becomes a problem when large parts (800 × 400 × 500 mm3) are built. The acicular α′ microstructure of Ti-6Al-4V causes low fracture toughness and low ductility (